9.10.2 Self-Check on Looking for Relationships
Exercise 2: Writing a Word Formula
a) A pedometer counts the number of steps that you take over a given time period but you want to work out how far you have walked in yards. If your normal stride length is 0.75 yards write down a word formula that will allow you to calculate for any given number of steps how far you have walked.
b) Your electricity is charged at 15 cents per unit with a monthly standing charge of $2.50. Write a word formula that allows you to calculate your annual electricity bill in dollars.